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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd77551d392f2d223c44f608ef40be021174c6e2ac1db51820b8ca329332daa0' 
  AND token = 'C8mljTSm6/3aT7aXHZb+aRa841C9ToxIuIqsaSalzAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}